Rheostat.



M. M. GOLDENSTEIN, RHEOSTAL.

APPLICATION FILED APR-4| 1914.

1,280,713. I Patented Oct. 8,1918.

ga 98 9 29 v k 1 s1 t FWM am m This means, as shown in Fig. 1, includes a series of contacts 12 and a contact strip 13 associated with the rheostat. These contacts are arranged to be engaged by a bridging piece 1% carried by the cross-head 3 but in sulated therefrom. The arrangement is such that as the cross-head travels over the contacts 1 and 2 the contact piece 14 successively bridges the contacts 12 with the contact strip 13 to establish a shunt around the push-button 10. The contacts 12, however, are so arranged as to be engaged by the contact 14 only during the movement of the cross-head between centered positions on adjacent pairs of contacts 1 and 2. In other words, the contacts 12 are disengaged by the cross-head contact 14 and circuit between the same and the contact strip 13 is inter rupted whenever the cross-head 3 is centered on any pair of contacts 1 and 2.

As will now be apparent whenever the push-button 10 is operated to energize the switch 8 and thereby start the cross-head to the left the contact 14 on the cross-head will successively make and break the'shunt around said push-bptton to intermittently establish a maintaining circuit for the switch. Accordingly, should the push-button be released while said maintaining circuit is established the switch 8 will remain energized until said circuit is interrupted by the cross head. Also, it will be apparent that with the arrangement of contacts specitied the cross-head will interrupt the maintaining circuit immediately upon centering upon the pair of contacts 1 and 2 with which it engages when the puslrbutton 10 is released. In other words, whenever the pushhutton 10 is released with the cross-head oft center on any pair of contacts 1 and 2 the maintaining circuit controlled by the cross head will cause continued advance of said crosshead, until it rests squarely on such contacts.

The means described also provides for contering of the cross-head on its contacts when moved in the reverse direction butin a slightly different manner. \Vhcn the pushbutton 2? is operated to effect reverse operation of the cross'head it breaks circuit between the contacts 9. thereby interrupting the circuit through the push-button l0 and through the windingot switch 8, as aiore said. Thus all possible interference of the contacts 12 and 1:5 with the reverse operation of the pilot motor is eliminated and the iilot motor will p rate to move the cross head to the right so long as the push-button 9 is held depressed. \Vhcu, however, the push-button t) is released it (it-energizes the switch 7 to disconnect the pilot motor from rircuit and at the same time again bridges contacts 9*; Accordingly if the cross-head is not centered on one mir of contacts 1 and 2 it will bridge one ot the contacts 12 with the contact strip 13 and thereby parallel the push-button 10 and energize the switch The switch 8 will thereupon respond to start the pilot motor in the reverse direction and return the cross-head 3 to the left until it is centered upon the nearest pair of contacts 1 and '2. Thus the only ditterence in the centering operation under reverse operations of the cr0sshead is tliat in one case the cross-head is automatically advanced to centered position while in the other case it is automatically returned to centered po sition.

More specitirally describing the circuit connections the same are as follows: The circuit controlled by the rheostat extends from line L by conductor 20 through said rheostat when in circuit closing position. by conductor 21 through the motor 6,'by conductor to line L.

The pilot motor circuit as established by the switch 8 extends from line L by conductor 23, through the field winding F, by conductor '24 through the contacts 7' of switch 7, l) \"conductor 25 through the motor armature, by conductor 26 through the contacts 8" of switch 8, by conductor 27 to line L. The pilot motor circuit as established by the switch 7 extends as aforesaid to conductor 24 thence through the contacts 8" of switch 8, by conductor 26 through the motor armature in a reverse direction to that previously described, by conductor 25 through the contacts 7 of switch 7 and thence by conductor 27 to line L.

The energizing circuit of the switch 8 extends from line L by conductor 28 through the up contacts of push-button 9. by conductor 29 through push-button 10, by conductor 30 through the winding 8 to conductor 27 and line L. The energizing circuit of the switch 7 extends from line L by conductors 28 and 31 through the down contacts of push-button t). by conductor 32 through winding 7 to conductor 27 and line L. The shunt. around the push-button 10 comprises a lead 33 from the contact strip 13 to conductor 29 and a lead 34 from the contacts 12 to conductor 30.

Referring now to Fig. 2, the same shows a modified form of shunting device for the puslnbutton 10. device comprises stationary contacts 35 and 36 and a rcvoluble bridging contact 37. The contact 237 is so constructed that when the samc is revolved it will make and break circuit between the contacts 35 and 36 and thereby lllllkl and brcak he shunt around the push-button 1). Further said contact 37 is suitably connected to the. pilot motor to be operated thereby and its contact surfaces are so proportiom-d Us to maintain circuit bctwccn c mm-i 32,1 and 36 only during successive movcuwnts oi the. rheostat between adjacent pairs of contacts land 2. It breaks circuit whcnc-vcr the cross-head is centered on any pair of contacts 1 and 2. Accordingly it willfunction in the same manner and accomplishes the same result as the contact buttons 12 and contact strip 13 of Fig. 1. Of course, in

practice, the contact 37 may be connected to the pilot motor to give any desired speed ratio therebetween.

What I claim as new and desire to secure by Letters Patent is 1. In combination an adjustable member, power operating means therefor, and control means for the latter to effect adjustment of the former in opposite directions to different degrees, said means including control parts associated with said member and unidirectional. starting means for said power operating member responsive to said control parts to insure against arrest of said adjust 'able member following its movement in either direction except in predetermined positions.

2. In combination, an adjustable rheostat, an electric driving motor therefor, and control means for said motor to eifect reverse operations thereof for adjustment of said rheost-at in reverse directions and to different degrees, said means including means associated with said rheostatto eflect unidirectional operation of said motor for prevention of the arrest of said rheostat between predetermined positionsof rest. i

3. In combination, an adjustable member, power operating means for efi'eeting adjusti ve movement thereof in opposite directions and to ditterent degrees, and'means acting upon said power operating means under certain. conditions for automatically insuring uni directional positioning movement of said member following adjustive movement thereof in either direction.

4. In combination, an adjustable rheostat, an electric driving motor therefor, separate clectron'esponsiw switches for starting said motor in opposite directions for reverse ad justments of said rheostat and todegrees varying with the duration of energization of the selected switch and means associated with said rheostat to control a certain one of said switches for operation of said motor to insure against arrest of said rheostat except in predetermined spaced positions rcgardless of'its direction of adjustment.

In combination, an adjustable rheostat, an electric driving motor therefor, separate electro-rcsponsivc switches for starting said motor in opposite directions for reverse adjnstments of. said rheostat, moans con trolling; said switches to direct the operation of said motor and adjustment of said rhcostat and. means associated with said rhcosfat to energize a certain one of said switches indepen-it ently of said directing means when the rhcostat is in any other than predetermiued spaced positions of rest to thereby insure 'said against arrest of said rheostat except in one of such positions, said directing meai'is ren dering said, last mentioned iiucz'ans ineilective during cnergiaation oil. the other of said switches to prevent interference of said switches.

6. In cou'ibination, an adjustable member, power operating mean H1 and control means for the latter to eiiect adjustment of the former in opposite directions and to different degrees, said means including control parts associated with said member and starting means for said power operating means responsive to said control parts upon movement of said adjustable member in either direction to provide uni-directionai movement thereof for insuring against arrest of said member except in predetermined positions.

7. In combination, an adjustable member, power operating means for moving the same in opposite directions to varying degrees, control mean for said opera ting means, and means associated with said member effective automatically under certain conditions to actuate said controi means for initiating move ment of said member through said operat ing means.

8. In combination, an adjustable member, power operating means for effecting adj ustment thereof to di'flcrent degrees, and means associated with said member and effective automatically under certain conditions to initiate action or said operating means for positioning of said member.

9. In combination, adfinstablc member, power operating means for efl'ecting adjust ment thereof in opposite directions and to different degrees, electro-responsive control means for said operating means, and a eir edit controller therefor operating" in synchronism with said power means. and'eii'ective automaticaiiy under certain conditions to actuate said control means for initiating movement of said pew/er means.

it). In a controller, in combination a pinrality of contacts, an eiectronir n ticaliy operated member operable in opposite directions to be arrested in cup emeni: with any selected one of said contacts, means perating "with said'mci bezto alternately make and break power circuit therefor, s circuit when completed, eii'ecti'ig operr ion of device in a predetermined i'lirecticn and means insuring against interferen e of said former means with the reverse open tion oi said member.

11. in a'controller, 'incomhimition, a plurality of cont cts, an electromaf'ncticaliy operated member, means for eitccting opation of said member in either direction d for arresting; the same in engagement with any one of said contacts, and means operating during HlUVtlilQlli'. of said member to alternately realm and break a pmver cirllli cuit therefor, said power circuit, when com- In witness whereof, I have hereunto subpleted, effecting movement of said member scribed my name in the presence of two witin one direction for the purpose set forth,

5 ated to reverse the movement of said mem- Witnesses:

nesses. and said first mentioned means, when oper- MAURICE M. GOLDENSTEIN.

ber, rendering said second mentioned means S. Wmnorr, temporal-11V meifectlve. L. TRAUTMAN. 

